Table 3 Stepwise regressions between glomalin features and various soil properties, and their differences at different soil layers (Stepwise regression: F-enter probability value was at p < 0.01, and F-removal probability value was at p > 0.05). The constants in the models were not listed in the table for minimizing the size of the table.

From: Glomalin contributed more to carbon, nutrients in deeper soils, and differently associated with climates and soil properties in vertical profiles

Y	Parameters	Surface soils 0–40 cm				Deep soils 40–100 cm
Y	Parameters	Unstandard B	Standard Beta	Sig	R²	Parameters	Unstandard B	Standard Beta	Sig.	R²
EEG	SOC	0.02	0.41	0.00	0.53	pH	−0.26	−0.59	0.00	0.69
	MAT	−0.18	−0.31	0.00		MAT	−0.17	−0.28	0.00
	pH	−0.27	−0.60	0.00		EC	−0.001	−0.17	0.00
	Altitude	−0.001	−0.29	0.00		Altitude	−0.001	−0.26	0.00
	water	−0.01	−0.17	0.01		SOC	0.026	0.32	0.00
TG	SOC	0.20	0.50	0.00	0.63	SOC	0.32	0.60	0.00	0.62
	MAP	0.06	0.60	0.00		pH	−1.28	−0.43	0.00
	water	−0.17	−0.36	0.00		water	−0.07	−0.17	0.00
	MAT	−1.46	−0.34	0.00
EEG/SOC	SOC	−0.001	−0.60	0.00	0.48	MAT	−0.009	−0.28	0.00	0.53
	MAT	−0.007	−0.41	0.00		water	−0.001	−0.25	0.00
	pH	−0.005	−0.35	0.00		pH	−0.015	−0.59	0.00
						MAP	0.000	−0.33	0.00
						SOC	−0.001	−0.18	0.00
TG/SOC	SOC	−0.004	−0.45	0.00	0.24	pH	−0.070	−0.48	0.00	0.30
	MAP	0.001	0.616	0.00		water	−0.007	−0.34	0.00
	water	−0.004	−0.34	0.00		SOC	−0.005	−0.19	0.01
	MAT	−0.029	−0.29	0.00
EEG/N	N	−0.01	−0.50	0.00	0.58	MAT	−0.018	−0.48	0.00	0.55
	MAT	−0.009	−0.38	0.00		EC	−7.8E-5	−0.17	0.00
	pH	−0.006	−0.34	0.00		N	−0.013	−0.27	0.00
	water	−0.001	−0.28	0.00		pH	−0.011	−0.36	0.00
						water	−0.001	−0.23	0.00
TG/N	N	−0.120	−0.80	0.00	0.40	pH	−0.071	−0.43	0.00	0.38
	SOC	0.007	0.49	0.00		N	−0.135	−0.48	0.00
	pH	−0.022	−0.18	0.01		water	−0.006	−0.26	0.00
						SOC	0.010	0.34	0.00
						K	0.001	0.18	0.00
EEG/P	P	−0.050	−0.45	0.00	0.18	P	−0.146	−0.24	0.00	0.06
EEG/P	SOC	0.001	0.28	0.00
TG/P	P	−0.314	−0.47	0.00	0.21	P	−0.972	−0.26	0.00	0.07
TG/P	SOC	0.007	0.33	0.00
EEG/TG	SOC	−0.006	−0.44	0.00	0.31	MAT	−0.19	−0.37	0.00	0.17
EEG/TG	MAT	−0.057	−0.38	0.00		SOC	−0.01	−0.17	0.01
Statistics	climatic entered/total	9/29 = 31.0%		6/30 = 20.0%
	physiochemical entered/total	8/29 = 27.6%		13/30 = 43.3%
	nutrient entered/total	12/29 = 41.4%		11/30 = 36.7%
	SOC times/ \|average\|	8/0.44			6/0.30
	pH times/ \|average\|	4/0.37			6/0.48
	EC times/ \|average\|	0/0			2/0.17
	MAT times/ \|average\|	6/0.30			4/0.35

Note: water is soil water percentage. SOC times mean the times of SOC entering the stepwise models, pH, EC and MAT times had the similar meaning. EEG/SOC, relative ratio of the carbon in EEG to total SOC; TG/SOC, relative ratio of the carbon in TG to total SOC; EEG/N, relative ratio of the nitrogen in EEG to total soil N; TG/N, relative ratio of the nitrogen in TG to total soil N; EEG/P, relative ratio of the phosphorus in EEG to total soil P; TG/P, relative ratio of the phosphorus in TG to total soil P; EEG/TG, relative ratio of the EEG to TG.

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